I agree with FHH on this one, a lot of guys, even (maybe espeically) experienced pilots are sloppy and have gotten used to having way more power than they know what to do with.

But it is certainly possible to pull your typcial .40 size trainer with that engine.

As a suggestion, put a low pitch prop on the engine, something like a 10x3 or 10x4 will help pull the big trainer will the smaller engine.